Response Analysis And Adams Simulation Of Nonlinear Starting And Stopping For Vibration Machine

Nowadays,various vibrators have been widely applied to metallurgy,coal,chemical industry,light industry and other departments with thieir working states divided into far vibration state and near resonance state.In this paper,the research object is dd1740 single axis inertia vibrator,working in far vibration state.When the excitation frequency is equal to the natural frequency in the process of start-up and stop vibration,the amplitude value of the system will increase sharply,which harmful to the body and foundation of the vibrator.Based on the single axis inertial vibrator system with fixed eccentric block,the inertial vibrator system with elastic eccentric block is proposed in this paper.According to the research problems,the vibration system with complex structure is simplified,and the actual problems are simulated and analyzed by ADAMS software.The dynamic model of the vibration system is established.Based on the multi-body dynamic simulation technology,the start-up and stop transition process of the single axis inertial vibrator system with fixed eccentric block and the inertial vibrator system with elastic eccentric block are simulated.The main research work can be summarized as the following three aspects:According to the structure and working condition of the inertial vibration machine,the mechanical model of the inertial vibration machine is established.According to the Lagrange and d'Alembert principles in analytical mechanics,the nonlinear equations of the inertial vibration machine with elastic eccentric block and the inertial vibration machine with fixed eccentric block are established.The nonlinear equations are transformed into the state equations,and by using the nonlinear vibration equation of the inertial vibration machine,the relationship between the rotational momentum,position,displacement and velocity variable of the eccentric block with time is derived.And the response curve of the vibration process of the vibration machine is solved by the numerical program of Runge-Kutta method.The main parts of the vibration machine are modeled by Solid Works software.According to the composition of the vibration machine system and the assembly relationship between the parts,the assembly body of the vibration system is established.The 3D model of the inertial vibration system is imported into ADAMS software,and the model of the vibration machine is constrained in Adams / view.The dynamic model of the single axis inertial vibrator with fixed eccentric block and inertial vibrator with elastic eccentric block are established.The dynamic simulation of the inertia vibrator system with elastic eccentric block and fixed eccentric block is carried out;the amplitude curves of the starting and stopping process of the mass center of the vibrator system are obtained,which are compared with the theoretical calculation.The influence degree of different parameters on the starting and stopping process of the vibrator is studied.The response curves of the transition process of the vibration starting andstopping are obtained by using the numerical program compiled by the computer,and the response curves produced by different parameters are compared and analyzed.